code: def load_pncc_code(path="pncc_code.mat"):
      """load pncc code of BFM
      PNCC code: Defined in 'Face Alignment Across Large Poses: A 3D Solution Xiangyu'
      download at http://www.cbsr.ia.ac.cn/users/xiangyuzhu/projects/3DDFA/main.htm.
      Args:
          path: path to data.
      Returns:
          pncc_code: [nver, 3]
      """
      C = sio.loadmat(path)
      pncc_code = C["vertex_code"].T
      return pncc_code
  
file_path: insightface/python-package/insightface/thirdparty/face3d/morphable_model/load.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import scipy.io
label_desc: Use image node_id 4 for calling a global function with example usage: load_pncc_code(path) and returns: pncc_code